Backport to branch(3.15) : Fix Cassandra case insensitive issue (#2904)

Co-authored-by: Kodai Doki <[email protected]>

Author: feeblefakie

core/src/main/java/com/scalar/db/storage/cassandra/CassandraAdmin.java

@@ -218,7 +218,9 @@ private TableMetadata createTableMetadata(com.datastax.driver.core.TableMetadata
       ClusteringOrder clusteringOrder = metadata.getClusteringOrder().get(i);
       builder.addClusteringKey(clusteringColumnName, convertOrder(clusteringOrder));
     }
-    metadata.getIndexes().forEach(i -> builder.addSecondaryIndex(i.getTarget()));
+    metadata
+        .getIndexes()
+        .forEach(i -> builder.addSecondaryIndex(unquoteIfNecessary(i.getTarget())));
     return builder.build();
   }
 
@@ -318,8 +320,8 @@ public void addNewColumnToTable(
     }
     try {
       String alterTableQuery =
-          SchemaBuilder.alterTable(namespace, table)
-              .addColumn(columnName)
+          SchemaBuilder.alterTable(quoteIfNecessary(namespace), quoteIfNecessary(table))
+              .addColumn(quoteIfNecessary(columnName))
               .type(toCassandraDataType(columnType))
               .getQueryString();
 
@@ -524,4 +526,14 @@ public String toString() {
       return strategyName;
     }
   }
+
+  private String unquoteIfNecessary(String identifier) {
+    if (identifier == null) {
+      return null;
+    }
+    if (identifier.length() >= 2 && identifier.startsWith("\"") && identifier.endsWith("\"")) {
+      return identifier.substring(1, identifier.length() - 1).replace("\"\"", "\"");
+    }
+    return identifier;
+  }
 }